george



(No Model.)

' P. W. ST. GEORGE.

CONSTRUCTION OF SEWERS 0R GONDUITS.

No. 434,845. Patented Aug. 19, 1890.

UNITED STATES PATENT OFFICE.

CONSTRUCTION OF SEWERS OR CONDUITS.

SPECIFICATION To all whom it may concern:

.Be it known that I, PERCIVAL WALTER ST. GEORGE, of the city of Montreal, in the district of Montreal and Province of Quebec, Canada, have invented certain new and useful Improvements in the Construction of Sewers or Conduits; and I do hereby declare that the following is a full, clear, and exact description of the same.

My invention has for its object to produce a sewer which shall be more easily constructed and more durable than those now built up in brick-work, and have its constituent parts more easily handled and set in place than lengths'of complete cross-sections of such conduits, and be strongest at the points at which most resistance must be offered to the pressure of the earth.

It may be thus briefly described: The sewer is composed in oval cross-section of four piecesviz., the invert, the two curved sides, and the top archall these breaking joint at their longitudinal junctions. The invert is flat on the bottom and has the skewbacks formed by its upper edges hollowed for the reception of the curved edges of the sections forming the sides, which, at their junction with the invert, are given such increased strength and thickness as will prevent the pressure of the earth from breaking them in. These sides have their top edges slightly sloping outward, and affording, with a flange formed on each side section and projecting outward and above them a continuous socketjoint to receive the top. arch, the edges of which correspond to the tops of the side sections, thereby protecting the haunch or springing of the arch-21 e., the point at'which it is weakest-and especially so against external pressure. \Vhen any connection is to be inade -such as a house-drain with the sewerone of the side sections (having formed in it an opening which will serve either for a right or left junction, and a rim formed round it by the thickening of the substance of which the sewer is composed) may be substituted for a side piece of the ordinary type.

forming part of Letters Patent No. 434,845, dated August 19, 1890.

Application filed May 29, 1890.

Serial No. 353,612. (No model.)

For full comprehension of the invention, reference must be had to the annexed drawings, in which-- Figure 1 is a section in perspective of the sewer, and Fig. 2 a sectional view showing connection of house-drain.

Like symbols indicate corresponding parts.

A is the invert, preferably fiat on the bot= tom, for the convenience of setting, a a being the skewbacks hollowed, as shown. B B are side pieces of the curve and varying thick ness shown, I) I) being the curved bottom edges fitting into the sockets a a. B B are the outwardly-sloping top edges of these side sections, and B B flanges, formed where shown, to prevent any lateral movement of the arched top 0, the lower edges 0 C of which correspond to and rest on the edges B, thus forming a strengthening continuous socket-joint or flange. These several sections A, B B, and O are made of any desired length, with butt-joints, and laid breaking joint.

In Fig. 2, D D show lengths of ahouse drain-pipe connected with the sewer, E being an opening formed in one of the side sections B, and B being an extra thickness making a rim round it.

What I claim is as follows:

1. In a sewer, the combination of the following elements forming an oval in cross-section: the invert A, with hollowed skewbacks, side sections with curved lower edges fitting into skewbacks and strengthening socketjoints formed by flanges 13 on top, and top arch O, resting in such socket-joints, all as herein set forth.

2. The combination, with the invert A and arched top 0, of curved sides B B, having flanges B and curved lower edges fitting into skewbacks, one or more lengths of such sidesforrned with openings E and rim B in combination with a drain-pipe, all as and for the purposes set forth.

PERCIVAL \V. ST. GEORGE.

Witnesses:

WILL. P. MoFEA'r, FRED. S. SEARS. 

